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Probably damaged memory. If computer memory is damaged the memory is marked as bad by controller on the chip. A lower amount of memory is reported to the operating system.

Also Windows XP will only address 4gb of ram without using a physical address extension. More than this is ignored.

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Q: What is the reason that a computer might report an amount of memory that does't match the actual amount installed?
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Physical memory is a term used to describe the amount of memory [RAM] installed in your computer.


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Start->right click on My computer->Properties and the window "Properties" you will see amount of memory installed on your computer.


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That depends. The "commit charge" is the maximum amount of physical and virtual memory available on your computer. Your computer will have a certain amount of physical memory (RAM) installed in it; each program that's opened uses a certain amount of memory. If your computer needs more memory it uses part of your hard disk that's called a "paging file"; it's kind of like a reserve gas tank as far as memory goes. This is also called "virtual memory". So, if you had 1 gigabyte of memory installed and your paging file size was 2 gigabytes, your total "commit charge" would be 1 gig + 2 gig for a total of 3 gigabytes, or 3000000K. So, for your numbers to go down like that, either your paging file size was reduced or the amount of physical memory in your system was reduced. You'd need to know how much memory was installed before your computer got repaired, and what the technician did when he/she repaired your computer. Did they remove any memory? Did they swap out the motherboard (the "guts" of the computer) with one that had less memory installed? OR for some reason did they just reduce the size of the paging file? Answering those questions will tell you what happened.


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